Improve security text grammar; wrap text

SECURITY.md

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 # Security Policy
 
 ## Supported Versions
+
 Security updates are applied only to the latest release.
 
 ## Reporting a Vulnerability
-If you have discovered a security vulnerability in this project, please report it privately. **Do not disclose it as a public issue.** This gives us time to work with you to fix the issue before public exposure, reducing the chance that the exploit will be used before a patch is released.
 
-Please disclose it at our [security advisory](https://github.com/kjd/idna/security/advisories/new).
+If you have discovered a security vulnerability in this project, please
+report it privately. **Do not disclose it as a public issue.** This gives
+us time to work with you to fix the issue before public exposure, reducing
+the chance that the exploit will be used before a patch is released.
+
+Please disclose your issue through Github's
+[security advisory facility](https://github.com/kjd/idna/security/advisories/new).
 
-This project is maintained by a team of volunteers on a reasonable-effort basis. As such, vulnerabilities will be disclosed in a best effort base.
+We will endeavor to prioritize review, remediation and disclosure of
+vulnerabilites. However, be mindful that this project is maintained by a
+team of volunteers who work on a best effort basis.